Jake Dethlefsen

They havent charged me anything for the work and pretty much all the parts they've replaced so i know they're doing right by me but i did pay for a new EBCM because i requested a new one just in case the old one was shot which they gave me for $400. They replaced my calipers so i know its not that and the pads and rotors are brand new thats what fustrates me, practically everything to do with the brakes and abs system is all replaced but hasnt changed a thing except they said that it hasnt locked up like before but still grabs hard and pulsates the abs. Im good friends with the head mechanic and we're both scratching our heads on this one just thought I'd see if anyone else has had the same problem and figured out what it was because right now its just a waiting game with gm.

So i bought a 2011 gmc Sierra from a certified chevy dealer with just over 80k miles on it. Test drove it nothing wrong but after rolling off the lot about 10 miles down the road i start getting a pulse in the brake pedal and a clicking noise from the front tires at all speeds and stronger when applying the brake to the point where it would sometimes completely lock up my brakes until it would throw codes for the abs, traction control, and stabilitrak and then it would stop doing it until it resest the codes down the road or upon restarting but it always seems to act up after about 10 miles of driving. So i take it back to the dealers shop and they hook up the computer and the wheel speed sensors are throwing codes so they clean the mount area and replace the sensors same problem happens so then they replace the rotors same problem happens so then they rewire my entire abs and wheel speed sensor control wiring still nothing so then they check my EBCM(electronic braking control module) fix the conector prongs that were short or loose and replace the module still nothing and so now they're out of ideas and speaking with the gm factory. What could be happening? Please help.